Raspberry Pi Pico 2 (RP2350)

Fig. 1. Raspberry Pi Pico 2 (RP2350), 2x20 castellated. Hover or tap a signal to light up every pin that carries it.

• The header is the same as the Pico 1: same 40 pins, same positions, same GP numbers. A carrier board or a HAT built for a Pico takes a Pico 2 without changes.
• You pick the architecture at build time. The RP2350 carries two Cortex-M33 cores and two Hazard3 RISC-V cores on the same die, and the bootloader selects which pair runs. Only one pair at a time.
• 520 KB of SRAM against the Pico 1's 264 KB, 4 MB of flash against 2 MB, and 12 PIO state machines across three blocks against 8 across two.
• PWM slice numbering does not carry over. The RP2350 has 12 slices where the RP2040 had 8, so the slice and channel a given GPIO lands on differs above GP15. Let the SDK work it out rather than porting hard-coded slice numbers.
• Still 3.3 V and still not 5 V tolerant.
• Peripheral mappings are not fixed: each pin lists the SPI, I2C or UART instance it can reach and you choose in software. Two pins on one instance cannot serve the same role at once.
• ADC_VREF is a filtered 3.3 V reference and AGND is the analog return. Use those for analog work rather than a digital ground pin.
• The RP2350 A2 stepping has a documented errata on GPIO input latching when a pin is switched from output to input with a pull-down. If an input reads stuck high, check the errata before blaming your wiring.
• On the Pico 2 W the wireless chip takes GP23, GP24, GP25 and GP29 internally, exactly as on the Pico W. None of those are on the header anyway.

• Drive a pin and read one

  Pico SDK

  #include "pico/stdlib.h"
  
  #define LED 25                 /* on-board LED, not on the header */
  
  gpio_init(LED);
  gpio_set_dir(LED, GPIO_OUT);
  gpio_put(LED, 1);
  
  gpio_init(15);
  gpio_set_dir(15, GPIO_IN);
  gpio_pull_up(15);              /* pulls are off until you ask */
  
  if (!gpio_get(15)) {
  }

  gpio_init resets the pin to SIO and clears both pulls, so call it before set_dir, not after. On a Pico W the LED is on the wireless chip and GPIO 25 does nothing.

Table 1. Pin assignments.